{"id":1538,"date":"2024-09-14T11:36:53","date_gmt":"2024-09-14T14:36:53","guid":{"rendered":"https:\/\/thiagorossi.com.br\/blog\/?p=1538"},"modified":"2025-11-25T16:13:54","modified_gmt":"2025-11-25T19:13:54","slug":"serving-pwa","status":"publish","type":"post","link":"https:\/\/thiagorossi.com.br\/blog\/serving-pwa\/","title":{"rendered":"Serving PWA"},"content":{"rendered":"<span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Tempo de leitura: <\/span> <span class=\"rt-time\"> 4<\/span> <span class=\"rt-label rt-postfix\">minutos<\/span><\/span>\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>Serving PWA<\/strong>: O processo de <strong>Serving (Entrega de Conte\u00fado)<\/strong> em um PWA \u00e9 totalmente redefinido pelo <strong>Service Worker (SW)<\/strong>. Ao contr\u00e1rio de um website tradicional (que sempre busca recursos da rede), o SW atua como um <em>proxy<\/em> program\u00e1vel, permitindo que voc\u00ea controle a origem de cada ativo solicitado (seja do Cache ou da Rede).<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">O cora\u00e7\u00e3o dessa l\u00f3gica \u00e9 o evento <strong><code>fetch<\/code><\/strong>.<\/p>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading has-large-font-size\">1. \u2699\ufe0f O Evento <code>fetch<\/code>: Interceptando Requisi\u00e7\u00f5es<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Toda vez que a p\u00e1gina controlada pelo Service Worker solicita um recurso (via <code>&lt;img&gt;<\/code>, <code>&lt;link&gt;<\/code>, <code>fetch()<\/code>, etc.), o SW dispara o evento <code>fetch<\/code>. Este evento fornece a oportunidade de <strong>interceptar<\/strong> a requisi\u00e7\u00e3o e fornecer uma resposta personalizada.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">A m\u00e1gica acontece com <code>event.respondWith()<\/code>, que deve receber uma <strong>Promise<\/strong> que resolve para um objeto <code>Response<\/code>.<\/p>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Estrutura B\u00e1sica do <code>fetch<\/code><\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">JavaScript<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ service-worker.js\n\nself.addEventListener('fetch', (event) =&gt; {\n  \/\/ event.respondWith espera uma Promise que produzir\u00e1 uma Resposta\n  event.respondWith(\n    \/\/ A l\u00f3gica de cache, rede, ou ambos, entra aqui:\n    \/\/ Exemplo: Simplesmente tenta buscar na rede (sem cache)\n    fetch(event.request) \n  );\n});\n<\/code><\/pre>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading has-large-font-size\">2. \ud83d\udee1\ufe0f Estrat\u00e9gia I: Cache First, Network Fallback (Confiabilidade)<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Esta \u00e9 a estrat\u00e9gia mais comum para o <strong>App Shell<\/strong> (ativos est\u00e1ticos como HTML, CSS e JavaScript), pois prioriza a velocidade e a funcionalidade <em>offline<\/em>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Fluxo:<\/h3>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li class=\"has-medium-font-size\">Busca o recurso no <strong>Cache API<\/strong> (usando <code>caches.match(event.request)<\/code>).<\/li>\n\n\n\n<li class=\"has-medium-font-size\">Se encontrado (HIT), retorna imediatamente.<\/li>\n\n\n\n<li class=\"has-medium-font-size\">Se n\u00e3o encontrado (MISS), busca na <strong>Rede<\/strong>.<\/li>\n<\/ol>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">JavaScript<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>event.respondWith(\n  caches.match(event.request)\n    .then((response) =&gt; {\n      \/\/ Se 'response' \u00e9 definida (encontrada no cache), retorna\n      return response || fetch(event.request); \n      \n      \/\/ NOTA: Se buscar na rede, a nova resposta n\u00e3o \u00e9 armazenada automaticamente. \n      \/\/ \u00c9 necess\u00e1rio um c\u00f3digo extra para adicionar o novo recurso ao cache.\n    })\n);\n<\/code><\/pre>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"has-medium-font-size wp-block-paragraph\">Vantagens: Carregamento instant\u00e2neo e funcionalidade offline.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Desvantagens: Pode servir vers\u00f5es desatualizadas se o Service Worker e o cache n\u00e3o forem versionados corretamente.<\/p>\n<\/blockquote>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading has-large-font-size\">3. \ud83c\udf10 Estrat\u00e9gia II: Network First, Cache Fallback (Atualiza\u00e7\u00e3o)<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Ideal para <strong>dados din\u00e2micos<\/strong> (como requisi\u00e7\u00f5es de API ou o HTML principal) que precisam estar o mais atualizados poss\u00edvel.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Fluxo:<\/h3>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li class=\"has-medium-font-size\">Tenta buscar o recurso na <strong>Rede<\/strong> (<code>fetch(event.request)<\/code>).<\/li>\n\n\n\n<li class=\"has-medium-font-size\">Se o fetch for bem-sucedido, armazena a nova resposta no cache e a retorna.<\/li>\n\n\n\n<li class=\"has-medium-font-size\">Se o fetch <strong>falhar<\/strong> (usu\u00e1rio <em>offline<\/em> ou erro), busca a vers\u00e3o antiga no <strong>Cache<\/strong>.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">C\u00f3digo com Cache e Atualiza\u00e7\u00e3o<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">JavaScript<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>event.respondWith(\n  fetch(event.request)\n    .then((response) =&gt; {\n      \/\/ Verifica se a resposta \u00e9 v\u00e1lida antes de armazenar\n      if (!response || response.status !== 200 || response.type !== 'basic') {\n        return response; \/\/ Retorna resposta da rede sem cachear\n      }\n\n      \/\/ Clona a resposta (pois a original s\u00f3 pode ser consumida uma vez)\n      const responseToCache = response.clone();\n      \n      caches.open('runtime-cache') \/\/ Cache dedicado a dados de runtime\n        .then((cache) =&gt; {\n          cache.put(event.request, responseToCache);\n        });\n\n      return response; \/\/ Retorna a resposta original\n    })\n    .catch(() =&gt; {\n      \/\/ Se a rede falhou, busca a vers\u00e3o mais recente no cache\n      return caches.match(event.request);\n    })\n);\n<\/code><\/pre>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"has-medium-font-size wp-block-paragraph\">Vantagens: Garante que o usu\u00e1rio veja a vers\u00e3o mais recente quando online e fornece um fallback offline.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Desvantagens: Mais lento que o Cache First, pois sempre tenta a rede primeiro.<\/p>\n<\/blockquote>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading has-large-font-size\">4. \ud83d\uddc4\ufe0f Outras Estrat\u00e9gias Simples<\/h2>\n\n\n\n<figure class=\"wp-block-table has-medium-font-size\"><table class=\"has-fixed-layout\"><thead><tr><td><strong>Estrat\u00e9gia<\/strong><\/td><td><strong>C\u00f3digo (fetch Event)<\/strong><\/td><td><strong>Uso T\u00edpico<\/strong><\/td><\/tr><\/thead><tbody><tr><td><strong>Cache Only<\/strong><\/td><td><code>event.respondWith(caches.match(event.request));<\/code><\/td><td>Ativos pr\u00e9-cachiados no evento <code>install<\/code> que <strong>nunca<\/strong> mudam (\u00edcones, p\u00e1gina <em>offline<\/em>).<\/td><\/tr><tr><td><strong>Network Only<\/strong><\/td><td><code>event.respondWith(fetch(event.request));<\/code><\/td><td>Dados confidenciais ou que n\u00e3o podem ser armazenados (Analytics, Dados de Login).<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading has-large-font-size\">\u2705 Conclus\u00e3o<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>Serving PWA<\/strong>: O evento <strong><code>fetch<\/code><\/strong> do Service Worker \u00e9 o ponto de controle central para otimizar a entrega de conte\u00fado em um PWA. Ao dominar as diferentes estrat\u00e9gias de cache \u2014 como <strong>Cache First<\/strong> para ativos est\u00e1ticos (rapidez e <em>offline<\/em>) e <strong>Network First<\/strong> para dados din\u00e2micos (atualiza\u00e7\u00e3o) \u2014 voc\u00ea garante uma experi\u00eancia de usu\u00e1rio <strong>r\u00e1pida<\/strong> e <strong>confi\u00e1vel<\/strong>, atendendo aos padr\u00f5es de um aplicativo nativo.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Toda jornada tem um in\u00edcio, e o in\u00edcio para se tornar um desenvolvedor web \u00e9 dominar as seguintes tecnologias, que voc\u00ea encontra aqui mesmo:<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"\/category\/html\"><img loading=\"lazy\" decoding=\"async\" width=\"758\" height=\"426\" src=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/04\/html.webp\" alt=\"HTML\" class=\"wp-image-600\" srcset=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/04\/html.webp 758w, https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/04\/html-300x169.webp 300w\" sizes=\"auto, (max-width: 758px) 100vw, 758px\" \/><\/a><figcaption class=\"wp-element-caption\">HTML<\/figcaption><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"\/category\/css\"><img loading=\"lazy\" decoding=\"async\" width=\"758\" height=\"426\" src=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/04\/Capa-Artigos-Linux.webp\" alt=\"CSS\" class=\"wp-image-702\" srcset=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/04\/Capa-Artigos-Linux.webp 758w, https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/04\/Capa-Artigos-Linux-300x169.webp 300w\" sizes=\"auto, (max-width: 758px) 100vw, 758px\" \/><\/a><figcaption class=\"wp-element-caption\">CSS<\/figcaption><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"\/category\/javascript\"><img loading=\"lazy\" decoding=\"async\" width=\"758\" height=\"426\" src=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/04\/javascript.webp\" alt=\"Javascript\" class=\"wp-image-804\" srcset=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/04\/javascript.webp 758w, https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/04\/javascript-300x169.webp 300w\" sizes=\"auto, (max-width: 758px) 100vw, 758px\" \/><\/a><figcaption class=\"wp-element-caption\">JavaScript<\/figcaption><\/figure>\n<\/div>\n<\/div>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">E se voc\u00ea gosta do nosso conte\u00fado, n\u00e3o deixe de contribuir adquirindo os servi\u00e7os e produtos dos nossos apoiadores e empresas que somos associados:<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/hostinger.com.br\/?REFERRALCODE=1THIAGO62\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"250\" src=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/03\/hostinger.png\" alt=\"Hospedagem Hostinger\" class=\"wp-image-92\"\/><\/a><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/amzn.to\/3SNDYlc\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"250\" src=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/08\/ofertas-amazon.webp\" alt=\"Ofertas Amazon\" class=\"wp-image-1308\"\/><\/a><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/amzn.to\/3SNKmt0\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"250\" src=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/08\/amazonprime.webp\" alt=\"Amazon Prime\" class=\"wp-image-1307\"\/><\/a><\/figure>\n<\/div>\n<\/div>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Tempo de leitura: <\/span> <span class=\"rt-time\"> 4<\/span> <span class=\"rt-label rt-postfix\">minutos<\/span><\/span>Serving PWA: O processo de Serving (Entrega de Conte\u00fado) em um PWA \u00e9 totalmente redefinido&#8230;<\/p>\n","protected":false},"author":1,"featured_media":1497,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-1538","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-pwa","wpcat-16-id"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Serving PWA - BLOG THIAGO ROSSI<\/title>\n<meta name=\"description\" content=\"Serving PWA: Neste artigo, exploraremos em detalhes o conceito de serving em PWAs, com um foco especial no uso de service workers para ...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/thiagorossi.com.br\/blog\/serving-pwa\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Serving PWA - BLOG THIAGO ROSSI\" \/>\n<meta property=\"og:description\" content=\"Serving PWA: Neste artigo, exploraremos em detalhes o conceito de serving em PWAs, com um foco especial no uso de service workers para ...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/thiagorossi.com.br\/blog\/serving-pwa\/\" \/>\n<meta property=\"og:site_name\" content=\"BLOG THIAGO ROSSI\" \/>\n<meta property=\"article:published_time\" content=\"2024-09-14T14:36:53+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-11-25T19:13:54+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/08\/Capa-Artigos.webp\" \/>\n\t<meta property=\"og:image:width\" content=\"758\" \/>\n\t<meta property=\"og:image:height\" content=\"426\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/webp\" \/>\n<meta name=\"author\" content=\"Thiago 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